Internal-combustion engine



April 21, 1925.

F. MULLER INTERNAL COMBUSTION ENGINE Filed April 3, 1923 Patented Apr.21, 1925.

uNirEn s'rarss FRIEDRICH M'ULLER, OF VIENNA, AUSTRIA...

INTERNAL-COMBUSTION ENGINE.

Application filed April 3,

To nil who-m it may concem:

Be it known that I, FRIEDRICH a citizen of the Confederation ofSwitzerland, residing at IV Prinz Eugenstrasse 80, Vienna,

6 Austria, have invented Improvements in and Relating toInternal-Combustion Engines, of which the following is a specification.

This invention relates to internal combustion engines, in which theinjection air 10 compressor is located in. the immediate neighborhood ofthe point of injection and the delivery stroke of the compressor iscontrolled by the injection valve. The invention is based on theascertained fact that,

owing to the end of the delivery stroke of the compressor coinciding inpoint of time with the end of the compression period in the workingcylinder, in engines of this type no trouble can occur, even if theinjection valve should for any reason become leaky. For the injectionair produced by the compressor always, passes, without loss of volumeand with practically undiminished pressure into the Working cylinder.According to the invention this fact is made use of for increasing thereliability of the engine for a valveless' injection air compressor, inwhich, the compressor suction valve is replaced by suction slits orports in the wall of the cylinder, which are uncovered by the piston atthe end of the outward stroke, while the compression stroke of thecompressor is controlled by the injection air valve of the workingcylinder. he provi 86 sionof suction ports does away with the necessityof a check valve for the compressor cylinder, which may cause leakageswhen the engine is in operation. For the compression stroke in thecompressor takes place in 4a a totally enclosed space, as at thecommencement of the inward stroke the compressor piston already coversthe suction, ports, and the injection air cannot escape through valves,which may become leaky after being or in operation for some time, as isthe case where a compressor vided.

Thus the arrangement according to the' cylinder is, inserted in thesuction valve is pro-' It has already been proposed tosupplyair throughslits, but only in the case 01'' engines, in which the working cylinderis 1923. Serial no 629,672.

placed before the compressor cylinder and the latter is fed with workingor scavenging air, which has been previously compressed in the workingcylinder. Such arrangements have the disadvantage that, on the admissionmembers for the working air becoming leaky, the compressor will also beaffected.

The construction of the compressor cylinder in one piece with theworking cylinder or the cylinder head of the engine provides adifliculty, in so far as it is frequently not possible to make thecylinder, which is cast in the interior of a difficult casting, solidand free from pores. According to the invention the compressor cylinderis therefore made in one piece by itself and is inserted in the casting.The cylinder is preferably made so that, besides the suction ports forthe admission of atmospheric air, it has a joint makingsurface in theform of a valve seating, which shuts ofi' the Working cylinder, whilethe injection valve may also be placed in the inserted cylinder.

The accompanyingdrawing shows a constructional example of the subset ofthe invention, in which a is the worl b the compressor cylinder andports of the compressor.

0 the suction The compressor cylinder head'of the engine and theinjection air is forced at the end of the compression stroke of thecompressor, which coincides with the end of the compression stroke inthe working cylinder, through the passage 7", which is controlled by theneedle (1 and opens into the injection valve casing e and thereuponthrough the injection nozzle 9" into the combustion space of the engine.The injection valve casing e is inserted in the compressor cylinder. Thetight joint between the compressor cylinder and the working cylinder canbe effected by a ground-in conical surface. The tight joint between theinjection valve casing, which is inserted inthe compressor cylinder, andthe two cylinders can be effected in a similar manner.

With such an bility to has only tion valve, which is liable to becomeleaky owing to wear. No admission valves for compressed air are placedbefore the suction ports, which communicate directly with theatmospheric air. The admission of the injection air into the compressortakes place at the end of the outward stroke and at the trouble arising,for the compressor ting cylinder,

arrangement there is no lie-- suction ports in place of the sue--commencement of the inward stroke of the compressor piston withoutvalves and the compressor cylinder is closed during the compressionstroke only by the injection valve of the working cylinder, but evenshould the injection valve become leaky, no loss of injection air cantake place through it, as in the most unfavorable case the in- 'ectionair will simply enter the working cylinder somewhat sooner, whichhowever will not cause the engine to stop. But even leakages due to thecasting being porous are prevented. The compressor is inserted, that is,is made as an independent casting and can therefore be made of speciallydense material, which is of great importance, where the pressure of theinjection air may go up to 60 atmospheres. f

What I claim is:

1. In combination an internal combustion engine comprising a workingcylinder and an injection valve. forming the delivery valve of aninjection air compressor, a cylinder for the air compressor, a workingcylinder head recessed to receive said compressor cylinder, saidinjection valve extending through the cylinder head and the aircompressor cylinder.

2. In a Diesel engine having individual injection air compressors foreach cylinder, acylinder head, a compressor cylinder in serted in arecess in said head and an injection valve casing mounted in recesses inboth the cylinder head and the compressor cylinder to control thedischarge from said compressor.

3. In combination in an internal combustion engine a working cylinder, afuel injection valve and a valveless injection air compressor, thedelivery Valve of which is formed by the injection valve, a cylinderbody for said air compressor, the working cylinder having a recessadapted to receive said compressor body, and an injection valve casingadapted to be inserted in a recess in the compressor cylinder body.

4. In an internal combustion engine a working cylinder, an aircompressor cylinder body arranged in a recess in the working cylinder atright angles to the axis thereof, and an injection valve arranged in theaxis of the working cylinder and passing through a recess in thecompressor cylinder body, said injection valve serving as the deliveryvalve of the air compressor.

In witness whereof I have hereunto-signed my name in the presence of twosubscribing witnesses.

FRIEDRICH MULLER.

Witnesses Cant. LOUDENBURY, HUGO KEIK.

